2 BULLETIN 164, U. S. DEPARTMENT OF AGRICULTURE. 
an altitude as low as 1,800 feet, and occurs as a temporary type fol- 
lowing fire with little regard to elevation. 
Y, 
3 
o4ys 
2s 
Fic. 1.—Botanical distribution of lodgepole pine. 
SIZE, AGE, AND HABIT. 
Lodgepole is one of the smallest of the commercially important 
pines. In well-developed stands approximately 140 years old, at 
which age the tree may be considered mature, most of the merchant- 
